body{    
    margin: 0px;
}
#bg{
    width: 100%;
    height: 170%;
    top: 0px;
    left: 0px;
    z-index: -1;
    position: absolute;
}
#data{
    height: 25px;
    background-color: whitesmoke;
    border: 2px solid gray;
    margin-bottom: 10px;
    text-align: center;
}
#title{
    width: 1000px;
    margin: auto;
    color: aliceblue;
}
#main{
    top: 60px;
    margin: auto;
    width: 1000px;
    height: auto;
    background-color:whitesmoke;
    border: 2px solid gray;
}
.little{
    width: 950px;
    margin: auto;
    text-align: center;
}
#ckxx{
    text-align: left;
}

.blue{
    color: blue;
}